tbend0 = angle_map_range(tbend_raw, 0);
tbend1 = angle_map_range(tbend_raw + 180, -180);
tbend0 = angle_map_range(tbend_raw, 0);
tbend1 = angle_map_range(tbend_raw + 180, -180);
module Demo(){ ////toplevel
translate([-30,tubeheight,0]) HookL();
translate([ 0,tubeheight,0]) HookR();
translate([ 30, 0,0]) SHookL();
translate([ 60, 0,0]) SHookR();
module Demo(){ ////toplevel
translate([-30,tubeheight,0]) HookL();
translate([ 0,tubeheight,0]) HookR();
translate([ 30, 0,0]) SHookL();
translate([ 60, 0,0]) SHookR();